rails select tag with multiple values pre selected

Question

I am trying to have a multiple select box. select box will contain all the stores in the DB but the ones that the user belongs to will be selected. I'm half way there. I got a select box which has all the stores in the database. I'm unable to select the ones that the user belongs to. I have the following: ``` <%= select_tag 'stores[]', options_for_select(@stores.map {|s| [s.store_name, s.store_id]}, :selected => @user.stores.map {|j| [j.store_name, j.store_id]}), :multiple => true, :size => 10 %> ``` I have a map with stores that a user belongs to. it is in: ``` @user.stores ```

Accepted Answer

after a fair amount of trial and error the following worked for me:

```
<%= select_tag 'stores[]', options_for_select(@stores.map { |s| [s.store_name, s.store_id] }, @user.stores.pluck(:id)), multiple: true, size: 10 %>
```

rails select tag with multiple values pre selected

Solution

Problem